Wat can be done for him... what is the best way to help him ...
DUI / DWI Attorney
See my answer to your previous question.
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Criminal Defense Attorney
A defendant who has already served prison time on a felony charge has little hope of reopening the case. A defendant in that position might consult a lawyer who handles post conviction writs to see if there might be grounds to pursue an application for a writ of habeas corpus. Or, the defendant might apply for a pardon. To look into these, consult a reputable criminal defense lawyer in your area.
Answers on Avvo are for general information purposes only and should not be relied upon as legal advice. No attorney / client relationship is created by providing this answer. For specific advice about your situation, you should consult a competent attorney of your choosing.